When you open a lead, Myphoner locks it for you. The lead is removed from everyone else's queue, so no other agent can call it while you have it. When you action the lead, the lock is released.
If you don't action the lead, the lock expires 2 hours after you last opened it, and the lead goes back into the queues. Myphoner checks for expired locks every 10 minutes, so it can take a few minutes longer.
If you only want to look at leads without calling them or changing them, switch to view only mode. Tick "View leads only" in your preferences, or choose "Switch to view only mode" from the locked leads menu. In view only mode, opening a lead doesn't lock it and you can't action it, so supervisors and admins can look at leads while agents keep working their queues.
